They recently added portability, when I first set up my numbers, that was not an option. Posisble spin off from the cell phone industry?
For me it has been win/win. Cheap, reliable and cost effective. I can check voicemails from anywhere I can access the internet, monitor usage on a realtime basis and add lines in a few mouse clicks.
As far as taxation goes its sort of inevitable the the government catches on and ruins a good thing, but I think Vonage will weather the tax storm due to the fact that they will have a large subscriber base that will remain loyal when the raise rates.